Merge branch 'release/0.4.0'. This closes #3.

Author: eploko

README.md

@@ -44,12 +44,18 @@ Then you only need to write: `require("./parser.pegjs")`.
 
 You can pass options to PEG.js as [query parameters](http://webpack.github.io/docs/using-loaders.html#query-parameters). The following options are supported:
 
-  * `cache` — if `true`, makes the parser cache results, avoiding exponential
+  * `cache` — If `true`, makes the parser cache results, avoiding exponential
     parsing time in pathological cases but making the parser slower (default:
-    `false`)
+    `false`).
 
-  * `optimize` - whether to optimize the built parser either for `speed` or
-    `size` (default: `speed`)
+  * `optimize` - Whether to optimize the built parser either for `speed` or
+    `size` (default: `speed`).
+
+  * `allowedStartRules` - The rules the built parser will be allowed to start
+    parsing from (default: the first rule in the grammar).
+
+  * `trace` - If `true`, the tracing support in the built parser is enabled
+    (default: `false`).
 
 ``` js
 module.exports = {
@@ -58,7 +64,7 @@ module.exports = {
     loaders: [
       {
         test: /\.pegjs$/,
-        loader: 'pegjs-loader?cache=true&optimize=size'
+        loader: 'pegjs-loader?cache=true&optimize=size&allowedStartRules[]=RuleA,allowedStartRules[]=RuleB&trace=true'
       }
     ]
   }
@@ -74,6 +80,7 @@ Every release, along with the migration instructions, if any, is documented on t
 
 * [Victor Homyakov](https://github.com/victor-homyakov) for the propagation of the `cache` option.
 * [VladimirTechMan](https://github.com/VladimirTechMan) for the propagation of the `optimize` option.
+* [ragtime](https://github.com/ragtime) for the propagation of the `allowedStartRules` and `trace` options.
 
 ## License
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "pegjs-loader",
-  "version": "0.3.0",
+  "version": "0.4.0",
   "description": "PEG.js loader for webpack",
   "authors": [
     "Andrey Subbotin <[email protected]> (https://github.com/eploko)",

src/index.js

@@ -9,13 +9,27 @@ export default function loader(source) {
   const query = loaderUtils.parseQuery(this.query);
   const cacheParserResults = !!query.cache;
   const optimizeParser = query.optimize || 'speed';
+  const trace = !!query.trace;
+
+  let allowedStartRules;
+  if (typeof query.allowedStartRules === 'string') {
+    allowedStartRules = [ query.allowedStartRules ];
+  } else if (Array.isArray(query.allowedStartRules)) {
+    allowedStartRules = query.allowedStartRules;
+  } else {
+    allowedStartRules = [];
+  }
 
   // Description of PEG.js options: https://github.com/pegjs/pegjs#javascript-api
   const pegOptions = {
     output: 'source',
     cache: cacheParserResults,
     optimize: optimizeParser,
+    trace: trace,
   };
+  if (allowedStartRules.length > 0) {
+    pegOptions.allowedStartRules = allowedStartRules;
+  }
 
   return `module.exports = ${pegjs.buildParser(source, pegOptions)};`;
 }